【正文】 s duplicate broadcasts7. What protocol is used to allow redundant paths in a switched/bridged network?A). RIP B). Spanning Tree C). IGRP D). OSPF8. What does a bridge use to build its address table?A). Destination IP address B). Destination MAC address C). Source IP address D). Source MAC address 9. What happens to the Layer 2 and Layer 3 addressing of data as it is routed from LAN to WAN?A). The Layer 2 and Layer 3 addressing remain constant throughout the process.B). The Layer 2 addressing will remain constant, while the Layer 3 addressing will change.C). The Layer 2 addressing will change, while the Layer 3 addressing will remain constant.D). The Layer 2 and Layer 3 addressing will both change at each router encountered.10. When a host receives a data segment, what allows the host to determine which application should receive the segment?A). IP source addressB). IP destination addressC). PARD). sliding windowE). port numberF). SYN packet11. Which of the following protocols uses UDP for transport layer services?A). SMTPB). HTTPC). DNSD). FTP12. How are originating source port numbers assigned during the data encapsulation process?A). assigned manually by the user when starting the applicationB). assigned dynamically by the source hostC). assigned by the routing protocol during the lookup processD). assigned by the destination host during session negotiation13. What is the purpose of Positive Acknowledgment and Retransmission (PAR)?A). PAR allows the presentation layer to request that data be resent in a format the destination host can process.B). PAR provides a mechanism for the receiving device to request that all segments be retransmitted if one segment is corrupt.C). PAR helps ensure that a number of data segments sent by one host are received by another host before additional data segments are sent.D). PAR is used to renegotiate the window size during the synchronization process.14. Which of the following determines the amount of data that can be sent without an acknowledgment when sending a TCP segment?A). segment numberB). priority numberC). window sizeD). value in the length fieldE). value in the port fieldF). acknowledgment number15. Connectionoriented services involve which three phases?A). Connection establishment, Data transfer, Connection termination B). Connection establishment, Data transfer, Flow control C). Connection establishment, Flow control, Connection termination D). Data transfer, Flow control, Connection termination 16. Which mand sequence will permit access to all five router virtual terminal lines with a password of cisco?A). Router(configline)config telnetRouter(configline) line vty 0 5Router(configline) password ciscoB). Router(config) line vty 0 4Router(config) password ciscoC). Router(config) line vty 0 4Router(configline) password ciscoRouter(configline) loginD). Router(configline) config telnetRouter(configline) password cisco Router(configline) sessions 0 417. What is the correct sequence of initialization for a router that has a configuration file?A). Loads bootstrap, loads configuration file, loads operating systemB). Loads bootstrap, loads operating system, loads configuration file C). Loads bootstrap, loads RAM, loads operating system D). Loads operating system, loads configuration file, loads RAM18. If a router cannot find a valid configuration file during the startup sequence, what will occur?A). The startup sequence will reset.B). The router will enter setup mode.C). The startup sequence will halt until a va